Y'know, it's felt like ages since she'd taken solace in the Ruins, since she'd fled her own husband rather than seeing things through his perspectives, but to her, what perspective would bring harm to humans that fell? That had families, homes to go back to? Can you really blame her? She'd understand if they were evil, really. But what of the innocent?! It wasn't fair, especially if a child fell!
Not to mention, she and Asgore had once had two children. Asriel, and a human that fell, and they adopted into their home, took into their hearts, until they passed. They both lost their children that day, but Asgore, who she once loved so much, trusted with everything, chose the wrong way to go about it. Murder was wrong. She left when he wouldn't see her way. She'd been in the ruins since.
It was lonely, and the ruins were small, though filled with puzzles. But, if she could protect any other unfortunate humans that fell from the king by keeping them with her, preferably of their own choice, then it was worth it. Speak of, she best make a trip to that little patch of flowers. Someone could have fallen. And if so, she'd protect that human from certain death. From him.